Although there are some differences between these works, they agree pointing to the impact-generated magnesioferrites or Mg, Ni-rich spinels as the main magnetic phase within the K-T boundary microspherules.

2007) can be explained by the presence of highly oxidized (maghemitized) magnesioferrites (Mg, Ni-rich spinels) accompanied by a high proportion of goethite and haematite, which seem to be concentrated within the Fe-O spherules.

The magnetic residues of sample 75-503, consist primarily of chromite and magnesioferrite, which are highly enriched in Ir, Ni and Cr (Table 1, cf.

At these localities the spherules were associated with dark, clay-rich spherules full of quench crystals of magnesioferrite spinel, and enriched in iridium opposite the Ir concentration of the K/T boundary clay itself (33 and 2 ppb, respectively).

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